refs 918 add avatars to users
refs #918 fixed tests
refs #918 add:
 - js code to remove char if user is not selected
 - js code to show avatar
 - lxml iter parsing for users data
 - tests to secure new implementation
 - add lib requests to get new data from web server (via GET request)
refs #918 changes after code review
refs #918 changes after code review
refs #918 changes after code review
Merge pull request #7 from lukaszkoczwara/xml_users_bug_918

Xml users bug 918